# std::shared_lock<Mutex>::try_lock_until

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< cpp‎ | thread‎ | shared lock

template< class Clock, class Duration > bool try_lock_until( const std::chrono::time_point<Clock,Duration>& timeout_time ); |  | (since C++14)

Tries to lock the associated mutex in shared mode. Blocks until specified timeout_time has been reached or the lock is acquired, whichever comes first. On successful lock acquisition returns true, otherwise returns false. May block for longer than until timeout_time has been reached.

Effectively calls mutex()->try_lock_shared_until(timeout_time).

std::system_error is thrown if there is no associated mutex or if the mutex is already locked.

`Clock` must meet the Clock requirements. The behavior is undefined if `Mutex` does not meet the SharedTimedLockable requirements. The program is ill-formed if std::chrono::is_clock_v<Clock> is false.(since C++20)

### Parameters

timeout_time | - | maximum time point to block until

### Return value

true if the ownership of the mutex has been acquired successfully, false otherwise.

### Exceptions

- Any exceptions thrown by mutex()->try_lock_shared_for(timeout_time).

- If there is no associated mutex, std::system_error with an error code of std::errc::operation_not_permitted.

- If the mutex is already locked, std::system_error with an error code of std::errc::resource_deadlock_would_occur.

### Example

| This section is incomplete Reason: no example

### See also

lock | locks the associated mutex (public member function)
try_lock | tries to lock the associated mutex (public member function)
try_lock_for | tries to lock the associated mutex, for the specified duration (public member function)
unlock | unlocks the associated mutex (public member function)
try_lock_until | tries to lock (i.e., takes ownership of) the associated TimedLockable mutex, returns if the mutex has been unavailable until specified time point has been reached (public member function of `std::unique_lock<Mutex>`)

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